Evaluating the performance of the NarcotrendR EEG index during anaesthesia for cardiothoracic surgery: a single-centre retrospective study. - Ebensperger, Max; Kreuzer, Matthias; Kratzer, Stephan; Hight, Darren; Kaiser, Heiko A.; Schneider, Gerhard; Schwerin, Stefan (BMC Anesthesiology, 2025)